Question

(a)The breadth and length of a rectangle are both prime numbers.
What is the maximum area when its perimeter is 40cm?​

Answer 1

if we let breadth =x

and height is =y

so perimeter of rectangle is

2(x+y)=40 (given)

so x+y=20. eq.1

in the question we can see the breadth and height it should be prime no. and both no. addition should be 20 according to eq.1

so let x=7

y=13

then area of rectangle is x*y=7*13

=91

Answer 2

Answer:

91cm²

Step-by-step explanation:

l= 13cm

B=7cm

perimeter=2(l+B)

=2(13+7)

=2(20)

=40cm

area = l×b

=13×7

91cm²